Pi-Day on Craig Andera https://www.craigandera.org/tags/pi-day/ Recent content in Pi-Day on Craig Andera Hugo en-us Tue, 06 Oct 2026 10:25:07 -0400 Pi Day Ring https://www.craigandera.org/projects/pi-day-ring/ Fri, 06 Mar 2026 00:00:00 +0000 https://www.craigandera.org/projects/pi-day-ring/ A metal ring with a cut-out pi symbol, designed by my daughter for Pi Day 2026. My daughter generally designs jewelry for Pi Day. In 2026 she got done a little early, on March 6, which is eight days ahead of the 14th. Usually we're finishing up on the 13th.

This year's piece is a ring: ribbed, darkened bands with a pi symbol cut out across the front. The ribs are actually a mistake. Something to do with me setting up the rotary chuck on the laser wrong. But I liked the way it came out.

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An earlier year's effort is on the Pi Day Earrings page.

]]> Pi Day Earrings https://www.craigandera.org/projects/pi-day-earrings/ Mon, 14 Mar 2022 00:00:00 +0000 https://www.craigandera.org/projects/pi-day-earrings/ 3D-printed and painted earrings, designed to my daughter's specifications for Pi Day. Our family celebrates Pi Day. As part of it, my younger daughter wanted to make some earrings she could wear to school. I modeled them to her specifications, we 3D-printed them, and then spray-painted them. I wanted to cast them in metal, but I was having trouble and we had a deadline, so the plastic versions were what we went with. I think they came out great. She wore them to school on March 14th.

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Here's a close-up.

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Trying to cast them (February and March 2022)

Here's the wax pattern cast from the 3D print, in blue. Oh hey, it worked.

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Then I tried again, with what I thought was a better sprue design. This one is printed in grey resin.

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That earring is slightly convex, like a contact lens. I failed many times to cast it in brass and aluminum bronze, but I learned a lot doing it. In the end I just printed it and spray-painted it.

Pi Day 2023

The next year, my younger daughter had another Pi Day earring concept in mind: a sphere made up of the digits of pi. I worked through the math for it in OpenSCAD.

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This was the prototype, printed in white resin and coming together a few days before Pi Day. The design is hers.

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The finished earrings were done just under the wire on March 14th. I'm not sure why she wanted black, but they are as ordered.

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Here's a better picture, after she highlighted the numbers.

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Another look at the prototype.

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